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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf51c36ff2d22a9e307e09174a5e5c82c85f553cbac24341c75bb86de4ea42d' 
  AND token = 'XSarI5Nb83EYVwuqxxWMmnCeQiZaCX2mXHOO+BAAP7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}